Typewriter



May 15, 1923.

L. R.- ROBERTS TYPEWRITER Filed May 22 1920 2 Sheets-Sheet 1 2 mm 1 fl blfozmevs Patented May 15, 192 3.

' UNITED "STATES PATENT mm.

[Linux 3. nonnn'rs, or nu'rrinnronn, NEW JEnsnY, AssIGNon me n n. xonnn'rs" mnwnrrnn COMPANY, or s'rmronn, connnorrour, aconronarron pn DELAWARE.

To all 'uihom it may concemi I I ,Be it known thatI, LYMAN R. Rename,

a citizen of the United States, residing at Rutherford, county ofBerge-n and State of New Jersey,-have invented certain new and useful Improvements in Typewriters, fully described and represented in the following specification and the accompanying drawings, forming a part of the same. This invention relates to typewriters and particularly to case-shift mechanism. It is the principal object of the invention to provide a typewriter of the type having a shifting laten carriage such that bounci of tliecarriage is prevented. 'th this general object in view the invention consists 'in' the combinations, arrangements of parts and details of construction which will first be described'in connection with the accompanying drawings I and then more particularly pointed out;

In the .drawin a Fig. '1 is a view in side elevation of a t ewriter constructed in accordance with the invention;

Fig.2 is a view'of the same in rear elevation with parts broken away; 7 1

Fig. 3 is a view in vertical. section; Fig. 4 is a view in horizontal sectlon;

Fi 5 is a cross sectional view taken onthe hue 5-5 of Fig. 4. 7

Referring to the drawings-- In the embodiment of the invention here illustrated each type bar carries three type 85 characters and there is provision for a double case-shift to shift the platen and its carriage into an extreme or an intermediate position in accordance with the type character to be used. To this end, formingpart of the 40 key board, are two case-shift e The leverfor the extreme case-shift is pivotally mounted on a tie rod 52 near the rear of the machine and the intermediate case shift lever 51 is mounted to swing on- 45 ai'ock shaft 58.

The laten 54 has. its shaft 'journ-alled. in

the en pieces 55 of a carriage 56, .which is mounted to have the. usual reciprocating movement, by means of two sets of ball 5 bearings 57 riding in grooved rails 58 on the carriage and a doubly grooved guide 59. This carriage guide 59 is supported by upwardly extending arms 60 formed on a carriage truck in the form of a rigid .plate 61.

5 To give the. plate carriage case shift movevers 50, 51.

Application filed-May 22,1920. Serial no. 383,397. 3 1

ment, this truck ismounted' on two verti-.

cally reciprocating plungers 62 sliding in cylindrical bearing members 63 cast on the frame at the rear corners' In order that operation of the .case shift levers may cause the plungers to raise theplaten carriage, the .plungers are connected by a cross bar 64,-beneath which extends a 'liftin lever 65. This lifting lever is keyedor ot erwise secured to the .rock'shaft 53. Also secured to the rock shaft is an operating lever 66 over which extends a lug 67 formed on the case-shift lever 50 and a similar lugi 681. 9

formed 'on the case-shift lever 51. It will be seen that on the depressing of either case-shift-lever', its lug will engage the operatinglever 66 thus rocking shaft 53, and

this in'turn causes the'l'iftin'glever 65 to engage the cross bar 64 and raise the plan gers 62, thus shifting the vertical position the washer 69 is/wedge shaped and is se cured to the frame by screws passing through arcuate slots 70. By shifting the washer 69 on its centers a greater or less amount of metal is interposed in the path of the cross bar and the movement allowed wardly extending arm 72 carrying a pin 73- g which rides in a slot 74 formed in amovable plate 75. This plate has a second slot 76.

which rides over two aligned pins 77. With this construction, operation of the case-shift lever. causes a rearward, horizontal move ment of-the plate 75. This plate carriesv a spacing lug 78, so arranged as to be'.interposed between the cross bar and the washer 69 when the plate is moved b operation of the case-shift lever. It will the carriage to be moved to an intermev e seen, therefore, that the case-shift lever 51 will cause ios diate position only, as it is limited' by the engagement of the cross bar with the spac-. ing lug. Adjustment may be made also for this case-shift by movement of the washer 69 as above described.

75 ofjthe platen carriage. The limit of movement for the extreme case shift isfixed by,

the engagement of the cross bar 64 with a washer 'or ring 69 secured to the framer .To make this limit o-fmovement adjustable,

- mounted locking is operated by the In order to prevent bouncing of the platen carriage during operation of the machine, the invention includes means for looking the carriage against raisin movement, and in structures embodyin .t e invention to the best advantage, a loc ing member is normally interposed between the carriage raising me'chanism and a fixed abutment. Although capable of various constructions, as here shown, on a cross shaft 80 are plates 81 provided with shoulders 82 which normally take over the cross bar 64. The upper end of each looking plate is in close proximity to a fixed abutment 83 formed on the frame of the machine. .The locking plates 81 are normal ly held in looking osltion by means of a spring 181 secured at one end to the shaft 80 and at the other end to the frame ofv the machine. With these locking plates interposed between the fixed abutment and the movable cross bar, the carriage is made substantially solid with the frame and any' bouncing of the carriage is prevented.

Means is provided for removing thelocking plates to permit case-shift movement of the platen carriage, and in structures embodying the invention to the best advantage, the locking plates are caused to be removed from locking position upon operation of either of the case-shift levers. As here shown, as an example, on the pivotal shaft 80 of the locking plates, is mounted a rocker. arm 84 having a rounded shoulder taking over a pin 85 on the operating lever 65. When the rock shaft action of either case-shift lever, the consequent movement of operating lever. causes pin 85 to swing the rocker arm 84 rearwardly.- This movement of the rocker arm, through shaft 80, causes the locking plates to swing out I permitting elevation of the plungers and t e platen carriage. Upon return of the carriage to normal position the locking plate again' moves into locking position by means of its spring 181.

In structures embodying the invention in its entirety, the cross bar 64 which connects the two plungers 62 serves as an assembling member for connecting the platen carriage with the frame, and is readily removable to permit removal of the carriage. Means is also provided for holding the cross bar in place without interfering with its ready removal. Although capable of various constructions, as here shown, the cross bar 64 passes through holes formed in the plungers 62 of a size to permit its ready removal and insertion. The cross bar, when, in place, extends out some distance beyond the plungers, as appears in' Fig. 2f ear each end, it is provided with a clrcumferem tial grooveto receive a spring pressed securing member. In the present embodiaeeao ment this securing member also serves as a balancing member for the carriage. As

shown, pivoted on a pin 86, at each side of of a coiled balance sprin of which is secured to t e'machine frame. With the construction described, the cross bar is held in place by the balancing members and to remove the cross bar it is only necessary to swing down the bell cranks away from the cross bar. Furthermore, this construction, with a balancing mechanism ateach side, provides a more even balance, as the weight "shifts with the travel of the carriage.

lVhat I' claim is:

1. In a typewriter,- and in combination, a frame, a case-shift unit movable in the frame and including a cross bar, a lifting lever foren aging said cross bar to caseshift said'u'nit, a locking member anchored The upper arm of the bellcrank 87 is notched to adjustably receive; the end 88, the other end frame and including a cross bar, a lifting lever for en aging said cross barto caseshift said un t, a rock shaft journaled in the frame, a locking member mounted on said rock shaft and normally hooking over said cross bar to hold the case-shift unit from movement out of normal position, and a rocker arm mounted on said rock shaft and operable upon operation of the lifting lever' to cause the removal of said locking member from looking position.

3. In a typewriter, and in combination, a frame, a case-shift unit movable in the frame and including a cross bar, a case-shift lever, a lifting lever havin an operative connection with said case-shift lever and engaging said cross bar to case-shift said unit,

a rock shaft journaled in the frame, a lockmg member mounted on said rock shaft and normally hooking over said cross rod to hold the case-shift unit against movement out of normal position, a rocker arm mounted. onv said rock shaft, and a pin on said lifting lever for engagin said rocker arm, whereby the locking mem or is removed from looking position upon operation of the case-shift lever.

4. In a typewriter, and in combination a frame, a case-shifting unit including a plurality of plungers reciprocating n said plungers supporting sai frame and a cross bar connectin said plungers, case shifting means inclu ing a lifting lever for engaging said cross bar, and a locking member anchored to said frame and normally hooked over said cross bar to hold said unit against movement out of normal position.

5. In a typewriter, and in combination, a frame, a platen carria e, a plurality of (I carriage and slidable in said frame, a cross bar connecting said plungers, and means acting on said cross bar to cause the plungers to be raised, said cross bar being readily removable to permit removal of the carriage and its plungers from the frame.

6. In a typewriter, and in combination, a frame, a p aten carriage, a plurality of plungers supporting said carriage and slidable in said frame, a cross bar connecting said plungers, said cross bar being readily removable to permit removal of the carriage and its plungers, and means normally tendin to hold said cross bar in place.

In a ty ewriter, and in combination, 'a frame, a p aten carriage, a plurality of plungers supporting said carria e and slid able in said frame, a removab e cross bar connecting said .plungers, and a spring-pressed balancing members earing against said cross bar.

8. In a typewriter, frame, a platen carriage, a plurality of plungers supporting said carriage and slidair of and in combination, a

able in said frame, a cross bar connecting said plungers, means acting on said crossbar to cause said plungers to be raised, and a pair of spring-pressed balancing bell-crank levers pivoted on the frame and bearing frame bearing in which said plunger reciprocate's, and a member'removab y connected with said plunger below said frame bearing, said carriage truck and its plungers being removable from the frame upon removal of said member. Y

10. In a typewriter, and in combination, a frame bearing, a case-shift unit, including a platen carria e truck, a plunger reciprocating in said earing and on which-said truck is. mounted, and a member removably connected with said plunger below said bearing and cooperating in limiting the case-shift movement of said unit, and means, including a lifting lever separably engaging a portion of said unit, for case shifting the unit, the truck and plungers being removable from the frame upon removal of said member.

In testimony whereof, I have hereunto set my hand.

LYMAN R. ROBERTS. 

